Kali Linux Alternatives (September 2025)

Find security issues, verify vulnerability mitigations & manage security assessments with Metasploit. Get the world's best penetration testing software now.

Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.

PortSwigger offers tools for web application security, testing, & scanning. Choose from a range of security tools, & identify the very latest vulnerabilities.

Ubuntu is the modern, open source operating system on Linux for the enterprise server, desktop, cloud, and IoT.

Ubuntu is the modern, open source operating system on Linux for the enterprise server, desktop, cloud, and IoT.

Ubuntu is the modern, open source operating system on Linux for the enterprise server, desktop, cloud, and IoT.

Ubuntu is the modern, open source operating system on Linux for the enterprise server, desktop, cloud, and IoT.

SUSE Linux Enterprise Server (SLES) is a highly reliable, scalable, and secure server operating system, designed to power mission-critical workloads.

BeEF is a security tool, allowing a penetration tester or system administrator additional attack vectors when assessing the posture of a target

Linux Mint is an elegant, easy to use, up to date and comfortable desktop operating system.

Pentest-Tools.com is a cloud-based toolkit for offensive security testing, focused on web applications and network penetration testing.

Use penetration testing (pentesting) and antivirus software to defend your corporate network from hacker attacks

Cuckoo Sandbox is the leading open source automated malware analysis system.

vPenTest is an automated network penetration testing platform that makes pentesting scalable, accurate, faster, consistent, and not prone to human error.

Discover how the powerful penetration testing solution, Core Impact, enables you to safely and efficiently test your environment by automating the techniques used by hackers. Get started today with this pen testing solution that is ideal for both new and advanced pen testers.

Europe’s leading bug bounty platform and penetration testing services provider.

An innovative platform for hardware, clouds, and containers, built with love by you.

Alpaquita Linux is the Alpine-based build fine-tuned for Java with glibc and musl support. Ideal for cloud deployment, containers, and native images.

Explore NetSPI's Penetration Testing as a Service (PTaaS) offering. Enhance your organization's security with expert assessments and actionable insights.

Hackrate makes cybersecurity testing transparent by providing a crowdsourced approach for continuous security testing and the industry's first solution for controlling and monitoring ethical hacker projects.

Ubuntu Core is Ubuntu for IoT and embedded devices, optimised for security and reliable over-the-air (OTA) updates. Run your applications in a high-security, immutable and reliable embedded Linux OS.

Timesys offers Linux, Android, and open source operating systems software security, engineering services, and development tools, for embedded software market

VeraCrypt is free open-source disk encryption software for Windows, Mac OS X and Linux. In case an attacker forces you to reveal the password, VeraCrypt provides plausible deniability. In contrast to file encryption, data encryption performed by VeraCrypt is real-time (on-the-fly), automatic, transparent, needs very little memory, and does not involve temporary unencrypted files.

Why Falco? Strengthen container security The flexible rules engine allows you to describe …

Experience unparalleled penetration testing with our elite team, dedicated to uncovering vulnerabilities and safeguarding your business assets.

Vumetric: The Penetration Testing Company You Can Trust. With 80+ certifications, our cybersecurity experts offer solutions to a wide range of industries.

A single console, with built-in security policies, for controlling Kubernetes clusters and applications.

A server security suite with centralized dashboard containing an AI-powered Linux malware scanner, robust IP reputation, WAF, Spam Detection.

MicroK8s is the simplest production-grade conformant K8s. Lightweight and focused. Single command install on Linux, Windows and macOS. Made for devOps, great for edge, appliances and IoT. Full high availability Kubernetes with autonomous clusters and distributed storage.

Bazaar version control system: easily manage source code on Windows, Ubuntu, GNU/Linux, and Mac OS X

The Microsoft Build of OpenJDK is a new no-cost long-term supported distribution and Microsoft’s new way to collaborate and contribute to the Java ecosystem.

.NET is a free, cross-platform, open-source developer platform. .NET has languages, editors, and libraries to build for web, mobile, desktop, games, and IoT.

Packetlabs is a Canadian based penetration testing company that improves your company's cybersecurity posture with state of the art penetration testing

Identify network threats and vulnerabilities before they become serious breaches with Penetration Testing services available from Verizon.

Beagle Security helps identify vulnerabilities in your web apps, APIs & GraphQL and remediate them with actionable insights before hackers harm you in any manner.

Red Hat Enterprise Linux is a stable, proven foundation that’s versatile enough for rolling out new applications, virtualizing environments, and creating a more secure hybrid cloud.

FreeRTOS is an open source, real-time operating system for microcontrollers and microprocessors that makes small, low-power devices easier to program, deploy, and secure.

Empower Your Security Strategy with Appsecure, Your Partner in Offensive Security Services. Trusted globally by Top Brands.

pgAdmin - PostgreSQL Tools for Windows, Mac, Linux and the Web

Discover the risks across your attack surface with Halo Security's complete attack surface management platform.

OpenCV provides a real-time optimized Computer Vision library, tools, and hardware. It also supports model execution for Machine Learning (ML) and Artificial Intelligence (AI).

Challenge, assess, and optimize your enterprise's cybersecurity posture with the number one Exposure Management & Security Validation platform.

Protect your organisation with LRQA Nettitude’s award-winning Cybersecurity Testing, Management & Consulting. Pen Testing & PCI. Speak to our experts today.

SapMachine : The OpenJDK release maintained and supported by SAP

Our penetration testing simulates a real-world attack on your digital assets to determine the strength of your security & defenses.

Low-touch virtual infrastructure with LXD at any scale. Built on top of Linux containers, LXD offers a unified user experience in managing system containers, virtual machines and clusters. Easily configurable, flexible and secure way to run your workloads.

Discover superior security solutions with Edgescan. From PTaaS to continuous security testing, we have your back. Learn more about our services.

Tabby is a free and open source SSH, local and Telnet terminal with everything you'll ever need.

Your Source for Awesome Helm-Charts!

Nextron Systems specializes in providing cutting-edge security solutions for Threat Detection and Response (TDR). Our goal is to assist you in safeguarding your company’s digital assets against an ever-evolving threat landscape.

VueScan is the easiest way to get your scanner working on macOS, Windows and more. VueScan includes a driver for your scanner even though it isn't support anymore.

Charles Web Debugging Proxy - Official Site

Autopsy® is the premier end-to-end open source digital forensics platform. Built by Basis Technology with the core features you expect in commercial forensic tools, Autopsy is a fast, thorough, and efficient hard drive investigation solution that evolves with your needs.

Learn how to optimize and secure your infrastructure with virtualization, management, cloud native computing tools, all included with Oracle Linux operating environment.

Open source Python framework for rapid development of applications that make use of innovative user interfaces, such as multi-touch apps.

OpenFOAM is the leading free, open source software for computational fluid dynamics (CFD), owned by the OpenFOAM Foundation and distributed exclusively open source under the General Public...

Amazon Corretto is a no-cost, multiplatform, production-ready distribution of the Open Java Development Kit (OpenJDK). Corretto comes with no-cost long-term support. Amazon runs Corretto internally on thousands of production services and Corretto is certified as compatible with the Java SE standard.

Open source software which you can use to easily create a beautiful website, blog, or app.

GnuPG is a free implementation of OpenPGP

Sylpheed - Sylpheed はシンプル、軽量かつ高機能で使いやすい、無料のメールソフトです。Sylpheed は Windows から Linux まで様々なプラットフォームに対応しています。

Drupal is an open source platform for building amazing digital experiences. It's made by a dedicated community. Anyone can use it, and it will always be free.

Bharat Security (BharatSec) provides top-notch cyber security services including vulnerability assessments, penetration testing, consulting, bug hunting, network security, and training programs.

Ispmanager is a Linux-based control panel for managing dedicated and game and VPS web servers, as well as selling shared hosting

Astra Security is a one of a kind continuous Pentest Platform that makes chaotic pentests a breeze & continuous with its hacker-style vulnerability scanner.

Strobes Pentesting as a Service (PTaaS) offers a personalized, cost-effective, and offense-driven approach to safeguarding your digital assets

IBM LinuxONE is an enterprise-grade Linux server that brings together IBM’s experience is building Z mainframe systems with the openness of the Linux operating system.

Open source desktop application that provides Kubernetes, Container Management, bundled utilities on the desktop

Get the highest-rated PC cleaning and optimization software for your Windows computer. Advanced System OptimizerGet the highest-rated best PC cleaning and optimization software for your Windows computer. Advanced System Optimizer works as a best junk cleaner, best ram optimizer, game booster as well.

It’s a web browser. But fun. It comes with a bunch of clever features built-in. It’s super flexible and does not track you. Get the Vivaldi browser for desktop, mobile, and your car!

Kratikal, India's leading CERT-In Empanelled cyber security organization, which offers cyber security services like VAPT and security compliance services.

FREE Shopping cart osCommerce to start selling online. Accelerate your business endlessly by adding apps and custom development. Open source eCommerce platform.

Instant Terminal Sharing

The 1st Line Of Defense

An open source Kubernetes Platform to manage enterprise-grade Kubernetes across hybrid cloud, multi-cloud and edge. Get started for free!

The Freedom to Create

WPScan is an enterprise vulnerability database for WordPress. Be the first to know about vulnerabilities affecting your WordPress core, plugins & themes.

nopCommerce is the most popular ASP.NET shopping cart in the world based on Microsoft technologies. Free and open-source eCommerce platform

Cyver Core is a Pentest collaboration platform delivering pentest reporting, pentest management, and pentest-as-a-service.

Mailspring: The open-source, extensible email app for Mac, Linux, and Windows with open tracking, link click tracking, contacts enrichment data and more.

Maltego is the all-in-one investigation platform that accelerates complex cyber investigations from hours to minutes. Mine, merge, and map all your essential intelligence in one place, and uncover hidden truths now!

Portainer is your container management software to deploy, troubleshoot, and secure applications across cloud, datacenter, and Industrial IoT use cases.

Darwin Attack® is a real-time pentest platform that helps you manage your security program. You can see testing updates as they are posted to the portal, and can communicate directly with your Evolve Security engagement team.

Explore our AI-driven penetration testing services, where automated tools and certified experts unite to deliver comprehensive pentest reports. Ensure compliance effortlessly with our intuitive platform, safeguarding your data and fortifying your operations from day one.

Number One Android Emulator in the Cloud with integrations for testing framework and CI servers. Also available for PC & Mac.

Discourse is modern forum software for your community. Use it as a mailing list, discussion forum, long-form chat room, and more!

GlobaLeaks - Free and Open-Source Whistleblowing Software

VxWorks is a high-performance real-time operating system (RTOS) for the development of robust mission-critical embedded systems for the intelligent edge.

GFI LanGuard enables you to manage and maintain endpoint protection across your network. It provides visibility into all the elements in your network, helps you assess where there may be potential vulnerabilities, and enables you to patch them. The patch management and network auditing solution is easy-to-use and easy-to-deploy.

Secure your Digital Assets SecureFense provides tailor made security solutions which can be integrated with your pipeline. Some of popular services are Penetration Testing & Red Team Assessments Get a Quote Contact Sales We've safeguarded numerous prominent enterprises against critical vulnerabilities that could be exploited At a Glance of Our Services We provide tailor made

TrueNAS is the World's #1 Open Source Storage. Based on OpenZFS, it is trusted by millions and deployed worldwide.

libGDX is a cross-platform Java game development framework based on OpenGL (ES) that works on Windows, Linux, macOS, Android, your browser and iOS.

OmegaT is a free open-source translation memory application for professional translators written in Java.

Pentera: Don't assume, validate. With Automated Security Validation™, ensure 'pretty certain' means secure. Trusted by top CISOs.

OpenFlows WaterCAD is an easy-to-use hydraulic modeling application for the analysis, design, and operation of water distribution systems.

Get 10 free parallel jobs for cloud-based CI/CD pipelines for Linux, macOS, and Windows. Automate builds and easily deploy to any cloud with Azure Pipelines.

Audacity is the world's most popular audio editing and recording app. Edit, mix, and enhance your audio tracks with the power of Audacity. Download now!

Zimperium is the only mobile security platform purpose-built for enterprise, securing both mobile devices and applications so they can securely access data.

TYPO3 is a free enterprise-class CMS based on PHP. It combines open source code with reliability and true scalability. This is the official project website.

Silent Breach is a cyber security agency that specializes in network security and digital asset protection. We help you protect your business and keep it safe.